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    Stumpjumper Alloy

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    2021 Stumpjumper Alloy

    The Stumpjumper Alloy brings all-new suspension kinematics and progressive geometry into a full-alloy package that's both lightweight and extremely durable. Outfitted with a no-fuss SRAM SX 12-speed groupset, the Stumpjumper Alloy is your all-access pass for trail adventure.

    Technical Specifications

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    Frameset

    Frame

    Alloy chassis and rear-end, asymmetrical design, 29 Trail Geometry, horst pivot BB adjustment, threaded BB, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel

    Seat Binder

    Alloy, 38.6

    Suspension

    Fork

    RockShox 35 Silver, Solo Air, 44mm offset, rebound adjust, TurnKey lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 140mm of travel

    Rear Shock

    X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout S1:190x42.5mm, S2-S6: 190x45mm

    Cockpit

    Saddle

    Body Geometry Bridge Saddle, steel rails

    SeatPost

    TranzX dropper, 34.9mm, S1: 100mm, S2: 125mm, S3: 150mm. S4-S5: 170mm, S6- 200mm

    Handlebars

    Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 780mm width

    Stem

    Alloy Trail Stem, 35mm bar bore

    Grips

    Specialized Trail Grips

    Brakes

    Front Brake

    Tektro Gemini Comp, hydraulic disc, resin pad, 200mm

    Rear Brake

    Tektro Gemini Comp, hydraulic disc, resin pad, 180mm

    Drivetrain

    Chainrings

    30T

    Crankset

    SRAM SX Eagle, S1:165mm, S2-S5: 170mm, S6: 175mm

    Rear Derailleur

    SRAM SX Eagle, 12-speed

    Shift Levers

    SRAM SX Eagle, trigger, 12-speed

    Cassette

    SRAM PG-1210 Eagle, 11-50t

    Chain

    SRAM SX Eagle, 12-speed

    Bottom Bracket

    SRAM Powerspline

    Wheels & Tires

    Rear Tire

    Purgatory, GRID Casing, GRIPTON® compound, 29x2.3"

    Rims

    Roval 29, hookless alloy, 30mm inner width, tubeless ready

    Front Tire

    Butcher, GRID casing, GRIPTON® compound, 29x2.3"

    Front Hub

    Specialized alloy front hub disc, sealed cardridge bearings, 6-bolt, 15x110mm thru-axle, 32h

    Inner Tubes

    Standard, Presta valve

    Spokes

    Stainless, 14g

    Rear Hub

    Alloy, sealed cartridge bearings, 12x148mm thru-axle, 32h

    * Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

    Geometry

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    S1S2S3S4S5S6
    Crank Length165mm170mm170mm170mm170mm175mm
    Handlebar Width780mm780mm780mm780mm780mm780mm
    Stem Length40mm40mm50mm50mm50mm50mm
    Saddle Width155mm155mm143mm143mm143mm143mm
    Seatpost Length100 mm125 mm150 mm170 mm170 mm200 mm
    Stack (Low BB)618mm613mm623mm631mm639mm649mm
    Stack (High BB)614mm609mm618mm627mm640mm644mm
    Reach (Low BB)410mm430mm450mm475mm500mm530mm
    Reach (High BB)416mm435mm455mm480mm505mm535mm
    Headtube Length100mm100mm110mm120mm130mm140mm
    Headtube Angle (Low BB)65°65°65°65°65°65°
    Headtube Angle (High BB)65.5°65.5°65.5°65.5°65.5°65.5°
    BB Height (Low BB)327mm332mm332mm332mm332mm332mm
    BB Height (High BB)334mm339mm339mm339mm339mm339mm
    BB Drop (Low BB)47mm42mm42mm42mm42mm42mm
    BB Drop (High BB)40mm35mm35mm35mm35mm35mm
    Trail (Low BB)126mm126mm126mm126mm126mm126mm
    Trail (High BB)122mm122mm122mm122mm122mm122mm
    Fork Length (full)550mm550mm550mm550mm550mm550mm
    Fork Rake/Offset44mm44mm44mm44mm44mm44mm
    Front Center726mm746mm770mm799mm828mm863mm
    Chainstay Length (Low BB)444mm444mm444mm444mm454mm454mm
    Chainstay Length (High BB)440mm440mm440mm440mm450mm450mm
    Wheelbase (Low BB)1168mm1188mm1212mm1241mm1280mm1315mm
    Wheelbase (High BB)1164mm1184mm1208mm1237mm1276mm1311mm
    Top-tube Length (horizontal)545mm563mm586mm615mm643mm676mm
    Bike Standover Height742mm742mm750mm753mm777mm784mm
    Seat Tube Length385mm385mm405mm425mm445mm465mm
    Seat Tube Angle (Low BB)77.7°77.7°77.5°77.2°77°76.9°
    Seat Tube Angle (High BB)78.2°78.2°77.9°77.7°77.5°77.3°
    Max Seatpost Insertion190mm190mm210mm230mm250mm270mm
    Min Seatpost Insertion100mm100mm100mm100mm100mm100mm
    Geometry

    Manual Downloads

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    Download Icon
    Specialized Bicycle Owner's Manual (All Languages)
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    Specialized Bicycle Owner's Manual Addendum: Riding With Kids
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    Trainer Usage Addendum to the Bicycle Owner's Manual
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    2021 Stumpjumper Alloy User Manual
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    2021 STUMPJUMPER ALLOY - USER MANUAL - SWEDISH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - SPANISH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - SLOVENIAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - SLOVAK
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    2021 STUMPJUMPER ALLOY - USER MANUAL - RUSSIAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - PORTUGUESE BRAZILIAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - POLISH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - NORWEGIAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - KOREAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - JAPANESE
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    2021 STUMPJUMPER ALLOY - USER MANUAL - ITALIAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - GERMAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - FRENCH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - FINNISH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - ENGLISH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - DUTCH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - DANISH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - CZECH
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    2021 STUMPJUMPER ALLOY - USER MANUAL - CROATIAN
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    2021 STUMPJUMPER ALLOY - USER MANUAL - CHINESE TRADITIONAL
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    2021 STUMPJUMPER ALLOY - USER MANUAL - CHINESE SIMPLIFIED
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    2017 FSR Tool Kit User Manual

    Rider Reviews

    • 4.5
    • 27 Reviews

    Awesome bike Awesome service

    Awesome bike Awesome service

    Would Recommend?
    Yes!

    Verified Buyer

    Icon

    Name:
    Guest G.

    Helpful?

    Stumpjumper Alloy

    Great bike to upgrade over time.... stock components perfectly decent, but frame is super compatible for gradual upgrading.

    Would Recommend?
    Yes!

    Name:
    Henry

    Helpful?

    Fantastic, aggressive ride, some weak components

    I've been riding this bike for 6 months and it is so much fun. The geometry is perfect (and adjustable), it's solid uphill and a total blast on the downs, especially on aggressive rocky terrain. It works fine out the box but is best thought of as a bike to upgrade over time. The Tektro brakes are a bit spongy and the powerspline crankset is heavy, while the rear shock is a bit limited. If you like to shop for upgrades, great; if you don't, perhaps consider the comp version.

    Would Recommend?
    Yes!

    Name:
    Stephen

    Helpful?

    Great bike, but flawed rear shock

    This is my fourth mountain bike, 3rd full suspension one. I was drawn to this particular bike because of, well yes, mainly it's looks, but also the fact it has a threaded BB and sealed bearings in the wheel hubs. I have the S4, probably S5 would've been marginally better as I'm 6 foot, but S4 was the only one available in this barren wasteland of new bikes. The riding position is a bit too upright for my liking so have replaced the stem for an 80mm and fitted flat bars, replacing the 30mm riser bar. Bike feels much better with these changes. The biggest flaw on this bike though is the rear shock.. Lockout is pretty much non existent to a point where the lever position of open to close makes no difference whatsoever to the feel of the bike, this impacts on hill climbing greatly. Once I've replaced this, I think it will be the perfect bike for me.


    Name:
    Chris

    Helpful?

    Great bike with aggressive specs

    This is my second MTB, first one is a $500 bike which can just do the job. But this one is superior, worth every penny I spent on it. I took it to ride as soon as it out of shop. Perfect


    Name:
    Rick

    Helpful?

    Paint very chip prone

    I have had it for over 6 months. The matte paint quality is very poor on this one and this is the only reason I am giving it 3 stars. My recommendation is to cover up the entire frame and rear triangle with frame protector. Even If a small rock hits it, it will chip the paint off very easily.


    Name:
    Zain

    Helpful?

    I love this bike!

    I ride this daily and it works downhill and i race xc on it. It's a beast! One bummer is it's heavy 35 lbs which is okay but you get what you pay for and your paying for good parts not low weight.


    Name:
    James M.

    Helpful?

    Great trail bike

    I am glad I bought a new stumpjumper alloy. The bike performs great on northeast trails. Built very strong. The 2.3 wide tires float over the soft and rooty ground. Great bike.


    Name:
    Tc

    Helpful?

    A great bike

    I choose to upgrade to FS and I will never look back. The bike is very smooth when riding technical terrain. I live in Texas so we do not have much elevation, but what I can say is that this bike can handle any Trail you throw at it, at least in Texas. Definitely recommend!


    Name:
    Chris

    Helpful?

    So far so good

    Im new to MTBing so its hard to compare it to other bikes. I purchased it 3 months ago and have been riding it at least once a week. I can basically fly over any bump, jump or stone. The sx derailer did brake off and broke a few spokes today. Not sure why but apparently its common on the shram sx derailleur. So expect to replace the derailleur, which should be an easy upgrade. I purchased the stumpjumper because of its geometry, which is similar to other highly reviewed bikes.


    Name:
    Newbie

    Helpful?